package org.apache.maven.repository.legacy;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.util.IdentityHashMap;
import java.util.Map;

import org.apache.maven.repository.ArtifactTransferEvent;
import org.apache.maven.repository.ArtifactTransferListener;
import org.apache.maven.repository.ArtifactTransferResource;
import org.apache.maven.wagon.events.TransferEvent;
import org.apache.maven.wagon.events.TransferListener;
import org.apache.maven.wagon.repository.Repository;
import org.apache.maven.wagon.resource.Resource;

public class TransferListenerAdapter implements TransferListener {

  private final ArtifactTransferListener listener;

  private final Map<Resource, ArtifactTransferResource> artifacts;

  private final Map<Resource, Long> transfers;

  public static TransferListener newAdapter(ArtifactTransferListener listener) {
    if (listener == null) {
      return null;
    } else {
      return new TransferListenerAdapter(listener);
    }
  }

  private TransferListenerAdapter(ArtifactTransferListener listener) {
    this.listener = listener;
    this.artifacts = new IdentityHashMap<Resource, ArtifactTransferResource>();
    this.transfers = new IdentityHashMap<Resource, Long>();
  }

  public void debug(String message) {
  }

  public void transferCompleted(TransferEvent transferEvent) {
    ArtifactTransferEvent event = wrap(transferEvent);

    Long transferred = null;
    synchronized (transfers) {
      transferred = transfers.remove(transferEvent.getResource());
    }
    if (transferred != null) {
      event.setTransferredBytes(transferred);
    }

    synchronized (artifacts) {
      artifacts.remove(transferEvent.getResource());
    }

    listener.transferCompleted(event);
  }

  public void transferError(TransferEvent transferEvent) {
    synchronized (transfers) {
      transfers.remove(transferEvent.getResource());
    }
    synchronized (artifacts) {
      artifacts.remove(transferEvent.getResource());
    }
  }

  public void transferInitiated(TransferEvent transferEvent) {
    listener.transferInitiated(wrap(transferEvent));
  }

  public void transferProgress(TransferEvent transferEvent, byte[] buffer, int length) {
    Long transferred;
    synchronized (transfers) {
      transferred = transfers.get(transferEvent.getResource());
      if (transferred == null) {
        transferred = (long) length;
      } else {
        transferred = transferred.longValue() + length;
      }
      transfers.put(transferEvent.getResource(), transferred);
    }

    ArtifactTransferEvent event = wrap(transferEvent);
    event.setDataBuffer(buffer);
    event.setDataOffset(0);
    event.setDataLength(length);
    event.setTransferredBytes(transferred.longValue());

    listener.transferProgress(event);
  }

  public void transferStarted(TransferEvent transferEvent) {
    listener.transferStarted(wrap(transferEvent));
  }

  private ArtifactTransferEvent wrap(TransferEvent event) {
    if (event == null) {
      return null;
    } else {
      String wagon = event.getWagon().getClass().getName();

      ArtifactTransferResource artifact = wrap(event.getWagon().getRepository(), event.getResource());

      ArtifactTransferEvent evt;
      if (event.getException() != null) {
        evt = new ArtifactTransferEvent(wagon, event.getException(), event.getRequestType(), artifact);
      } else {
        evt = new ArtifactTransferEvent(wagon, event.getEventType(), event.getRequestType(), artifact);
      }

      evt.setLocalFile(event.getLocalFile());

      return evt;
    }
  }

  private ArtifactTransferResource wrap(Repository repository, Resource resource) {
    if (resource == null) {
      return null;
    } else {
      synchronized (artifacts) {
        ArtifactTransferResource artifact = artifacts.get(resource);

        if (artifact == null) {
          artifact = new MavenArtifact(repository.getUrl(), resource);
          artifacts.put(resource, artifact);
        }

        return artifact;
      }
    }
  }

}
